Atrial standstill in suspected isolated cardiac sarcoidosis.

Most of the abnormal cardiac conduction system findings are atrial tachyarrhythmias in cardiac sarcoidosis. However, atrial standstill as a sick-sinus syndrome could be complicated in the case of diffuse atrial fibrosis. Herein, we present an interesting and valuable case of atrial standstill with suspected isolated cardiac sarcoidosis. <Learning objective: The chronic inflammation caused by isolated cardiac sarcoidosis could impair the conduction system. With atrial standstill, we recommend a comprehensive effort to investigate the potential etiology including cardiac sarcoidosis, particularly in the case of enlarged atrium and ventricular dysfunction.>.